works

app/proguard-rules.pro

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+# Keep line numbers for debugging stack traces
+-keepattributes SourceFile,LineNumberTable
+-renamesourcefileattribute SourceFile
+
+# kotlinx.serialization
+-keepattributes *Annotation*, InnerClasses
+-dontnote kotlinx.serialization.**
+-keepclassmembers class kotlinx.serialization.json.** { *** Companion; }
+-keepclasseswithmembers class kotlinx.serialization.json.** {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+-keep,includedescriptorclasses class com.example.fluffytrix.**$$serializer { *; }
+-keepclassmembers class com.example.fluffytrix.** {
+    *** Companion;
+}
+-keepclasseswithmembers class com.example.fluffytrix.** {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# Trixnity — keep all SDK classes (uses reflection/serialization heavily)
+-keep class net.folivo.trixnity.** { *; }
+-dontwarn net.folivo.trixnity.**
+
+# Ktor
+-keep class io.ktor.** { *; }
+-dontwarn io.ktor.**
+
+# OkHttp
+-dontwarn okhttp3.**
+-dontwarn okio.**
+
+# Koin
+-keep class org.koin.** { *; }
+
+# Coil
+-keep class coil3.** { *; }
+
+# JNA (used by Trixnity OLM bindings)
+-keep class com.sun.jna.** { *; }
+-keep class * implements com.sun.jna.** { *; }
+-dontwarn com.sun.jna.**
+
+# Media3 / ExoPlayer
+-keep class androidx.media3.** { *; }
+-dontwarn androidx.media3.**
+
+# Markdown renderer & syntax highlighting
+-keep class com.mikepenz.markdown.** { *; }
+-keep class dev.snipme.highlights.** { *; }
+-dontwarn dev.snipme.highlights.**
+
+# Olm native library
+-keep class org.matrix.olm.** { *; }